├── .gitignore ├── .jshintrc ├── LICENSE ├── README.md ├── demo ├── client │ ├── assets │ │ └── scripts │ │ │ ├── jquery-2.0.0.js │ │ │ ├── jquery-2.0.1.js │ │ │ ├── jquery-2.0.2.js │ │ │ ├── jquery-2.0.3.js │ │ │ ├── jquery-2.1.0.js │ │ │ ├── jquery-2.1.1.js │ │ │ ├── jquery-2.1.2.js │ │ │ ├── jquery-2.1.3.js │ │ │ ├── jquery-2.1.4.js │ │ │ └── jquery-3.0.0.js │ ├── demo.html │ └── standalone-sw.js └── server │ └── controller.js ├── index.js ├── lib ├── deltaApplier.js └── indexedDB.js ├── package.json ├── sw-delta.png └── test ├── benchmark ├── benchmark.js └── files.json ├── fixtures ├── angular.1.4.4-min.js ├── angular.1.4.4.js ├── angular.1.4.5-min.js ├── angular.1.4.5.js ├── bootstrap.3.3.4-min.css ├── bootstrap.3.3.4.css ├── bootstrap.3.3.5-min.css ├── bootstrap.3.3.5.css ├── jquery-2.0.0.js ├── jquery-2.0.1.js ├── jquery-2.0.2.js ├── jquery-2.0.3.js ├── jquery-2.1.0.js ├── jquery-2.1.1.js ├── jquery-2.1.2.js ├── jquery-2.1.3.js ├── jquery-2.1.4.js ├── jquery-3.0.0.js ├── small-text-1.txt └── small-text-2.txt └── unit ├── clientIndexTest.js └── deltaTest.js /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | demo/client/build/sw-delta.js -------------------------------------------------------------------------------- /.jshintrc: -------------------------------------------------------------------------------- 1 | { 2 | // JSHint Default Configuration File (as on JSHint website) 3 | // See http://jshint.com/docs/ for more details 4 | 5 | "maxerr" : 50, // {int} Maximum error before stopping 6 | 7 | // Enforcing 8 | "bitwise" : true, // true: Prohibit bitwise operators (&, |, ^, etc.) 9 | "camelcase" : false, // true: Identifiers must be in camelCase 10 | "curly" : false, // true: Require {} for every new block or scope 11 | "eqeqeq" : true, // true: Require triple equals (===) for comparison 12 | "forin" : false, // true: Require filtering for..in loops with obj.hasOwnProperty() 13 | "freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc. 14 | "immed" : false, // true: Require immediate invocations to be wrapped in parens e.g. `(function () { } ());` 15 | "indent" : 4, // {int} Number of spaces to use for indentation 16 | "latedef" : false, // true: Require variables/functions to be defined before being used 17 | "newcap" : false, // true: Require capitalization of all constructor functions e.g. `new F()` 18 | "noarg" : true, // true: Prohibit use of `arguments.caller` and `arguments.callee` 19 | "noempty" : true, // true: Prohibit use of empty blocks 20 | "nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters. 21 | "nonew" : false, // true: Prohibit use of constructors for side-effects (without assignment) 22 | "plusplus" : false, // true: Prohibit use of `++` & `--` 23 | "quotmark" : false, // Quotation mark consistency: 24 | // false : do nothing (default) 25 | // true : ensure whatever is used is consistent 26 | // "single" : require single quotes 27 | // "double" : require double quotes 28 | "undef" : true, // true: Require all non-global variables to be declared (prevents global leaks) 29 | "unused" : true, // true: Require all defined variables be used 30 | "strict" : false, // true: Requires all functions run in ES5 Strict Mode 31 | "maxparams" : false, // {int} Max number of formal params allowed per function 32 | "maxdepth" : false, // {int} Max depth of nested blocks (within functions) 33 | "maxstatements" : false, // {int} Max number statements per function 34 | "maxcomplexity" : false, // {int} Max cyclomatic complexity per function 35 | "maxlen" : false, // {int} Max number of characters per line 36 | 37 | // Relaxing 38 | "asi" : false, // true: Tolerate Automatic Semicolon Insertion (no semicolons) 39 | "boss" : false, // true: Tolerate assignments where comparisons would be expected 40 | "debug" : false, // true: Allow debugger statements e.g. browser breakpoints. 41 | "eqnull" : false, // true: Tolerate use of `== null` 42 | "es5" : false, // true: Allow ES5 syntax (ex: getters and setters) 43 | "esnext" : false, // true: Allow ES.next (ES6) syntax (ex: `const`) 44 | "moz" : false, // true: Allow Mozilla specific syntax (extends and overrides esnext features) 45 | // (ex: `for each`, multiple try/catch, function expression…) 46 | "evil" : false, // true: Tolerate use of `eval` and `new Function()` 47 | "expr" : false, // true: Tolerate `ExpressionStatement` as Programs 48 | "funcscope" : false, // true: Tolerate defining variables inside control statements 49 | "globalstrict" : false, // true: Allow global "use strict" (also enables 'strict') 50 | "iterator" : false, // true: Tolerate using the `__iterator__` property 51 | "lastsemic" : false, // true: Tolerate omitting a semicolon for the last statement of a 1-line block 52 | "laxbreak" : false, // true: Tolerate possibly unsafe line breakings 53 | "laxcomma" : false, // true: Tolerate comma-first style coding 54 | "loopfunc" : false, // true: Tolerate functions being defined in loops 55 | "multistr" : false, // true: Tolerate multi-line strings 56 | "noyield" : false, // true: Tolerate generator functions with no yield statement in them. 57 | "notypeof" : false, // true: Tolerate invalid typeof operator values 58 | "proto" : false, // true: Tolerate using the `__proto__` property 59 | "scripturl" : false, // true: Tolerate script-targeted URLs 60 | "shadow" : false, // true: Allows re-define variables later in code e.g. `var x=1; x=2;` 61 | "sub" : false, // true: Tolerate using `[]` notation when it can still be expressed in dot notation 62 | "supernew" : false, // true: Tolerate `new function () { ... };` and `new Object;` 63 | "validthis" : false, // true: Tolerate using this in a non-constructor function 64 | 65 | // Environments 66 | "browser" : true, // Web Browser (window, document, etc) 67 | "browserify" : false, // Browserify (node.js code in the browser) 68 | "couch" : false, // CouchDB 69 | "devel" : false, // Development/debugging (alert, confirm, etc) 70 | "dojo" : false, // Dojo Toolkit 71 | "jasmine" : false, // Jasmine 72 | "jquery" : false, // jQuery 73 | "mocha" : true, // Mocha 74 | "mootools" : false, // MooTools 75 | "node" : true, // Node.js 76 | "nonstandard" : false, // Widely adopted globals (escape, unescape, etc) 77 | "prototypejs" : false, // Prototype and Scriptaculous 78 | "qunit" : false, // QUnit 79 | "rhino" : false, // Rhino 80 | "shelljs" : false, // ShellJS 81 | "worker" : true, // Web Workers 82 | "wsh" : false, // Windows Scripting Host 83 | "yui" : false, // Yahoo User Interface 84 | 85 | // Custom Globals 86 | "globals" : { 87 | "Request": true, 88 | "Response": true, 89 | "Promise": true, 90 | "indexedDB": true 91 | } 92 | } 93 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL 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Many people have made 220 | generous contributions to the wide range of software distributed 221 | through that system in reliance on consistent application of that 222 | system; it is up to the author/donor to decide if he or she is willing 223 | to distribute software through any other system and a licensee cannot 224 | impose that choice. 225 | 226 | This section is intended to make thoroughly clear what is believed to 227 | be a consequence of the rest of this License. 228 | 229 | 8. If the distribution and/or use of the Program is restricted in 230 | certain countries either by patents or by copyrighted interfaces, the 231 | original copyright holder who places the Program under this License 232 | may add an explicit geographical distribution limitation excluding 233 | those countries, so that distribution is permitted only in or among 234 | countries not thus excluded. 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It is safest 289 | to attach them to the start of each source file to most effectively 290 | convey the exclusion of warranty; and each file should have at least 291 | the "copyright" line and a pointer to where the full notice is found. 292 | 293 | {description} 294 | Copyright (C) {year} {fullname} 295 | 296 | This program is free software; you can redistribute it and/or modify 297 | it under the terms of the GNU General Public License as published by 298 | the Free Software Foundation; either version 2 of the License, or 299 | (at your option) any later version. 300 | 301 | This program is distributed in the hope that it will be useful, 302 | but WITHOUT ANY WARRANTY; without even the implied warranty of 303 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 304 | GNU General Public License for more details. 305 | 306 | You should have received a copy of the GNU General Public License along 307 | with this program; if not, write to the Free Software Foundation, Inc., 308 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 309 | 310 | Also add information on how to contact you by electronic and paper mail. 311 | 312 | If the program is interactive, make it output a short notice like this 313 | when it starts in an interactive mode: 314 | 315 | Gnomovision version 69, Copyright (C) year name of author 316 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 317 | This is free software, and you are welcome to redistribute it 318 | under certain conditions; type `show c' for details. 319 | 320 | The hypothetical commands `show w' and `show c' should show the appropriate 321 | parts of the General Public License. Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | {signature of Ty Coon}, 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | 2 | sw-delta is an incremental cache for the web. It only downloads the delta between the old file in cache and the new file. 3 | 4 | Continuous delivery is great, but it comes at a price on performances. The more you deliver, the less browsers will use assets they had in cache, because of file versioning. Even if you only changed one letter in a file, it will get downloaded entirely. 5 | 6 | 7 | ## Service Workers to the rescue 8 | 9 | **sw-delta** is a project that makes the browser **download only the delta ( = diff = incremental download)** between the previously cached file and the required version of the file. It is based on the Service Worker API. 10 | 11 | 12 | ## How does it work? 13 | 14 | **Client-side:** a Service Worker intercepts every outgoing request. If the url matches one of the configured routes, than the Service Worker will compare the requested version with the version stored in cache. If an update is needed, the Service Worker will update the url to add the known version as a querystring, like this: 15 | 16 | ``` 17 | Asked url: http://domain.com/js/main-1.2.0.js 18 | Version in cache: 1.1.1 19 | Updated url: http://domain.com/js/main-1.2.0.js?cached=1.1.1 20 | ``` 21 | 22 | **Server-side:** the sw-delta querystring is recognized. If the server is able to find both versions in its file system, it computes a delta file and sends it to the browser. 23 | 24 | **Back to client-side:** the Service Worker generates the requested file from the known old file and the delta file, stores it in cache and sends it to the page. 25 | 26 | 27 | ## Installation and configuration 28 | 29 | You need to install the project both client-side and server-side. 30 | 31 | [List of server-side implementations.](https://github.com/gmetais/sw-delta/wiki/Server-side-implementations) 32 | 33 | [Client-side installation documentation.](https://github.com/gmetais/sw-delta/wiki/Installation) 34 | 35 | [Client-side API documentation.](https://github.com/gmetais/sw-delta/wiki/API) 36 | 37 | 38 | 39 | 40 | ## Questions/Answers 41 | 42 | #### Is it production ready? 43 | No, I don't think so. This is just the beginning of the project. I'm looking for beta-testers. 44 | 45 | #### What browsers are supported? 46 | Chrome, Firefox and Opera. This is 59% of compatible browsers, according to [Can I Use](http://caniuse.com/#feat=serviceworkers). 47 | 48 | It is designed as a progressive enhancement. Browsers that don't support Service Workers will redownload the full file as they've always done, while modern browsers will be able to ask for the delta only. 49 | 50 | #### Is it easy to install, client-side? 51 | The client-side should not be a problem. Your website needs to be served on HTTPS, this is a limitation built in the Service Worker API. Then you only need to load the service worker and it deals with everything. No other change is required on to the page. 52 | 53 | #### Is it easy to install, server-side? 54 | It's a bit more complicated. Your server needs to be able to handle delta requests and to compute them. 55 | 56 | #### What server-side technologies are compatible? 57 | For the moment, I only wrote [a NodeJS library, called sw-delta-nodejs](https://github.com/gmetais/sw-delta-nodejs). But any other language should be able to run sw-delta. It could also become a module for Apache and Nginx. 58 | 59 | #### How fast is the delta generation, server-side? 60 | It's slow. Calculating the delta for a file such as `angular.1.4.5-min.js` (143KB) takes 500ms. This is why the delta files should not be re-generated for every user and should be cached server-side. The easiest is to use sw-delta behind a reverse proxy (or a CDN). 61 | 62 | #### How fast does it take to apply the delta, client-side? 63 | This is pretty fast. The same `angular.1.4.5-min.js` file only takes 3ms to be regenerated from the delta. 64 | 65 | #### What's the size of a delta file? 66 | I've built a quick benchmark that measures the size of the delta files on a few famous libraries (testing for example jQuery being upgraded from v2.0.0 to v2.0.1). **The average delta file is 14% of the normal file.** But in fact, it all depends how often you deliver and how small are the changes you deliver. 67 | 68 | #### What's the algorithm behind the delta file computation? 69 | I'm using the [diff-match-patch](https://github.com/ForbesLindesay/diff-match-patch) npm module, which is a NodeJS wrapper around [google-diff-match-patch](https://code.google.com/p/google-diff-match-patch/). Then I compress the output in a home-made format. I'm pretty sure some improvements can be achieved on the speed and weight, don't hesitate if you have some ideas and use the [benchmark.js](/test/benchmark/benchmark.js) script to test them. 70 | 71 | #### Once installed on my project, how can I debug/see it in action? 72 | Using Chrome's Network panel, you are able to see one request from the page to the Service Worker, and another request from the Service Worker to the server. Firefox is not as good as Chrome, it does not show the requests from the SW. 73 | 74 | #### Why does sw-delta use IndexedDB instead of the Cache API in its Service Worker? 75 | ~~Because the Cache API does not allow the modification of a file before storing it into the cache.~~ It's actually possible and it will change soon (see issue [#2](https://github.com/gmetais/sw-delta/issues/2)). 76 | 77 | #### Do I need to keep all my old files versions on my server? 78 | Yes, it is best to keep them all. But it won't stop working if some files get deleted so you can delete the oldest ones if you need some disk space. 79 | 80 | #### How should I name/version my files to be compatible with sw-delta? 81 | Currently, the only supported format is `/some/path/name-version.ext`. The version can be any string. I recommend changing the version only when the content is really modified, to avoid unnecessary requests. An md5 hash of the file makes a perfect version number. 82 | 83 | 84 | ## Help is needed 85 | Any kind of help is more than welcome. If your use case requires a modification of the source code, than you're probably not the only one: please open an issue or a pull-request ;) 86 | 87 | 88 | ## Author 89 | Gaël Métais. I'm a webperf freelance. 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